Paper-bag machine



(No Model.)v

` W. CROSS.

PAPER BAG MACHINE.

No. 254.928. Patented Mar.14,1882.

' mmm@ 0mm By iI/zs Afforney N. PETERS. Fhowlihagrnpher. Washington. D. C.

3 Sheets-Sheet 3 UNTTEDl STATES PATENT OEEICE.

WILLIAM C. CROSS, OF BOSTON, MASSACHUSETTS.

PAPER-BAG MACHINE.

SPECIFICATION forming part of Letters Patent No. 254,928, dated March 14, 1882.

Application tiled December 7, 1881. (No model.)

`To all ywhom tt may concern:

Be it known that I, WILLIAM C. Gaoss, ot' Boston, Massachusetts, have invented certain new and useful Improvements in Machines for Making Satchel-Bottom Paper Bags, of which the following is a specication.

My invention mainly has reference to the operation of severing the iiattened paper tube in to bag lengths, and in its preferred embodiment involves the employment of the rotary nipper mechanism for opening the mouth ot' the blank described inv my Letters Patent No. 221,531, of November l1, 1879.

In making the diamond fold in accordance with-said Letters Patent it is requisite that `that ply of the blank which adjoins the nipperv roil should be atthe mouth end,`crosscut or severed at the point where it is to be grasped by the nipper, so as to permit the latter to take hold of the ply and open the mouth ofthe blank. tis impracticable for this cut to be made by the side slitting or cutting devices `carried by the nipper-roll and its fellow roll,

inasmuch as the `cutter-blade is there placed in such relation to the nipper that it must be I another with the greatest nicety and precision, in order to obtain a working machine, and the greater the number of parts the greater the dirficulty of makingand maintaining their proper adjustment. It is therefore particularly desirable in this class of machinery to reduce the number of working parts.

I have found that instead of employing a separate and distinct apparatus for making the transverse slit in the ply next to the n ipper-roll, the nipper may be successfully employed to do this work at the time itcloses on the ply. I thus impart to the nipper a-n added function, and I dispense entirely with the preliminary slit-forming mechanism. Itis in this feature that my improvement mainly resides, and I shall now proceed to more particularly describe the same by reference to the accompanyingdrawings, in whichI have represented so much of a satehel-bottom paper-bag machine as is needed for the purpose ofexplanation.

In the drawings, Figure 1 is a diagrammatic elevation, partly in section,'of the. nipper-roll and its fellow roll, and the diamond-fold-pressing rolls. Fig. 2 is a vertical central section of said rolls 011 the line 2 2, Figs. 4 and 5. Fig. 3 is a like section, (with the lower one of the first pair of rolls partly in elevatiom) representing the parts in the position they occupy when the diamond-fold-pressing rolls have made the nal cut and the nipper is just quitting its hold on the upper ply. Fig. 4 is a face View, partly in section, on line44, Fig. 1, ofthe nipper-roll and its fellow roll. Fig. 5 is a face view, partly in section, on line 5 5, Fig. 3, of the diamond-fold-pressing rolls. Fig. 6 represents the adjoining ends of two blanks after the side slits have been made. Fig. 7 repre'- seuts the same after the nipper has severed the central part of the upper ply. Fig. 8 represents the same after the two blanks have been completely severed and the diamond yfold of the rear blank subsequently laid.

Ais the trunk of the former, and B the guiderod extending out in front of the same, so as to pass between and beyond the meeting point of the nipper cylinder or roll O and its fellow roll D. In the latter roll is the reeiprocatory sliding cutter-blade a., for making' the side transverse slits, which is kept within the roll by a spring or springsin the usual way,and is forced out, so as to protrude from the roll, by a stationary cam or knocker, b, tired to the machine-frameateach side, which,'at the proper time during each revolution of the roll, actson a stud or roller, a', attached to the blade at each end and projecting from the ends of the roll. The cutter, when protruded from the roll, enters a recess, c, in the nipper-cylinder, and cuts through both plies of the attened tubular paper blank a2, except at the point where roo the guide rod or bar Bis situated, forming the side slits, 1, Fig. 6.

The vibratory nipper d is spring-controlled, and-is actuated to close against the stress of its spring by a stationary cam, c, fixed to the frame ofthe machine, with which a roller-stud,

` f, on a crank-arm fixed to the rocking nippershaft is caused at a similar time during each revolution of the nipper-cylinder to come in contact.

In theparts thusfar described there isno novelty. They are organized and timed intheir movements relatively to one another in the same manner and for the same purpose as described in my aforesaid Letters Patent.

The guide-bar B extends up to Within a suitable distance of the diamond-fold -pressing rollsE F, and has at a proper point on its face which adjoins the nipper-roll a projection or raised strip or bladelike protuberance, B', which acts to hold up the tubular paper blank that adjoins the nipper-cylinder away from the body of the guide-bar. may, it' desired, be made so as to be slightly springy at its free end.

The nipper el has a sharp serrated edge, as represented, and is so positioned that when it is closed by means of the cam e it will strike the central uncut part of the upper ply forcibly at a point just in advance of the part B', which latter will co-operate with it to sever the said part of that ply. The nipper thus acts first, as indicated in Fig. 2, to sever the ply at the point 2, Figs. 6 and 7, and then to enter the mouth of the blank at this point, and clamp the ply upon the cylinder C and pull back the ply, as indicated in Fig. 3, and as described in my aforesaid Letters Patent. Inasmuch as the cylinder C is in continuous rotation and the blank is continuously movingt'orward, the nipper, after it strikes the ply, will be carried around far enough by the moving cylinder to be out of the way of the end of the guide-bar before it clamps the upper ply on the cylinder, so that .the nipper and guide-bar will not interfere. The `central part of the under ply is still uncut, and the blank in front is in the bite of the rolls E F, which, after the upper ply of the blank is pulled back and released, press down and form the diamond fold, the upper ply being for that purpose released at the proper time from the hold of the nipper,

The rolls E F, which form and press the diamond fold ot' ythe blank, acted on bythe nippercylind-er and its fellow roll, also carry the cut.-

tingmechanism which severs the uncut central part of the under ply that connects the blank with the one in front. This cutting mechanism is a sliding reciprocatory spring-controlled blade, g, carried b v one roll and a recess, h, in the other roll, the blade being operated at the proper time by knockers g', which act against the stress of the spring or springs to protrude' the blade.

It will be noticed that the knockers g are so placed that the blade makes and completes the This projecting partx cut which severs the connection between the tWo blanks before the point of theblank in rear is in the bite ofthe rolls E F. The diamond fold is not made before the blank passes between the rolls E F. In fact, it' the blank be taken from themachine after the final dividingcnt by the blade g, but before entering the bite ofthe rolls, it will be found to be a mere fiattened tube, wit-hout creases indicative of the diamond fold. Thus the blank is completely severed from thc one in front before the diamond fold commences to be laid and before it isin the bite of the rolls. Practically, however, no difficulty is experienced on this account. When the machine is running at normal rate the speed at which the blanks travel is 'suoli that the point of the blank in rear, although disconnected from the blank in front, will be carried unerringly into the bite of the rolls E F. It'desired,however, provision may be made for carrying by positive means the point of the under plyinto the bite of the diamond-foldforming rolls. Such a provision is illustrated in the drawings, consisting of a presser foot or block, fi, carried by the blade g upon its rear face. When theblademakes the cut the presser clamps the end ofthe ply upon the roll F, as indicated in Fig. 3, and the knockers or'cams g are so shaped as to hold the presser down until the blank enters the bite of the rolls. The presser may, if desired, be made elastic or yielding, so as to conform to inequalities in the material operated on. The rolls E F, as before said, lay and complete the diamond fold, asindicated in Fig. 8, and the diamond-folded blank from these rolls passes to mechanism by which lines of paste are laid on the diamond fold and the end flaps of the latter are folded over to make the usual satchel bottom.

The rolls C D E F move in unison or at the same peripheral speed, and are driven positively by suitable gearing. I have, however, omitted to represent their drivin g-gear, in order not to obscure those parts in which my im provement is comprised; nor have I deemed it necessary to represent the means for forming and pasting the continuously-moving fiattened paper tube from which the blanks are successively cut by the mechanism herein described. These means are well known to those acquainted with the art to which my inven- IOO tion pertains, and require no description here.

portion of the bar may also, if desired, be made slightly yielding or elastic.

What I claim as of my own invention is- 1. `In combination with the guide-bar, the rotatin g nipper-cylinder, and the intermittentlymoving vibratorynipper carried by the same, adapted and arranged, substantially as hereinbefore s etfor'th, to sever or cross-cut the adjoining ply of the blank at the point Where said nipper subsequently takes hold of that ply in the operation of opening the mouth of the blank for the formation of the diamond fold.

2. The combination of the guide-bar, the vibratory nipper arranged and adapted, substantially as described, both to cross-cut at the mouth end of the blank that portion ofthe adjoining ply opposite to it and to take hold of the part of the ply thus cut, the rotating nipper-carrying cylinder or roll, its rotating fellowr roll, and the cutting mechanism carried by the same, the combination being and acting substantially as hereinbet'ore set forth.

3. The rotating diamond-fold forming or layring and pressing rolls and cutting mechanism carried by the same, arranged and operated, substantially as hereinbefore set forth, to make the nal cut which separates the blanks from one another before the blank in rear enters the bite of said rolls, in combination with mechanism, substantially as described, for opening the mouth of the blank and presenting it to said rolls, thev combination being and acting substantially as set forth.

4. The rotating diamond-fold forming or laying and pressing rolls, the cutting mechanism carried by the same, arranged and operated to make the iinal cut which severs the blanks from one another at the times specified, and the presser, in combination with mechanism, substantially as described, for opening the mouth of the blank and presenting it to said rolls, the combination being and acting substantially as set forth.

5. The guide-bar, the rotating nipper-cylnder and its fellow roll, the blank-cutting mechanism, and the vibratory nipper arranged and operating both to cross-cut and to grasp the central part of the adjoining ply at the times and in the manner substantially as specied, in combination with the rotating diamond-foldpressiug rolls and the final-cutting mechanism carried by the same, substantially as .and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 9th day of Novembor, 1881;

WILLIAM C. CROSS.

Witnesses:

ELiHU G. LooMIs, GEO. W. MORSE. 

